Improvement in dredging-machines



. NITED STATES PATENT OFFICE,

JOHN H. NEWOOMB, OE PORT NORRIs, NEw JERSEY.

IMPROVEMENT IN DREDGlNG-MACHINES.

To all whom it may concern:

Be it known that I, JOHN H. NEwooMB, of Port Norris, county ofCumberland, State of New Jersey, have invented a new and usefulImprovement in Machines for Dredging Oysters, Goal,.or other SunkenObjects; and I do hereby declare that the following is a full and exactdescription thereof, reference being had to the accompanying drawings,and to the letters of reference marked thereon.

The nature of my invention consists in attaching to the frame of theordinary dredgingmachine now in common use guards or fenders soconstructed as to act as aids to the teeth inperforniingtheir functionsin thepdredging process, and also to prevent the teeth from catching orbecoming fastened under the rails or chocks 'of the vessel as thedredging apparatus is being lifted or conveyed from the water to thedeck of the vessel, and to facilitate generally the process of haulingor lifting the dredging apparatus on board the vessel.

In order to enable others to make and use my invention, I will `proceedto describe its construction. y g

Figure l represents a view of the dredgingmachine now in common use. aet represent two arms, which constitute thev lower frame.

Fig. 2 represents a View of a dredging-machine with my improvementattached.

To the lower frame, Fig. l, so as to form a part thereof, I attach twoguards or fenders, as represented by c d c and c d e in Fig. 2, one oneach side thereof, the arrangement of which is as follows One end of theguards or fenders is secured to the arms a a of the lower Specificationforming part of Letters Patent No. 35,324, dated May 20, 1862.`

frame at a point marked c c. From thence the guards or fenders extendforward toward the teeth until they reach the plane of the teeth at anelevation, d d', equal to that of the height of the teeth, at whichpoint (l d' the direction is changed nearly at right angles toward theplate or bar in which the teeth are set, to which plate or bar theextremities of the guards or fenders may be attached by the ordinarymeans of a screw or bolt, as at the points e c'.

It will be observed that the guards or fenders, as thus attached, will,in eiect and operation, each constitute an additional tooth, which,being sharpened at the point d d by beveling or otherwise, is made toperform the functions of a dredging-tooth, while at the same time itacts as a guard or fender in protecting the dredging-teeth and inpreventing them from catching or becoming fastened to the rails orchocks of the dredging-vessel as thedredging apparatus is being drawn orlifted on board.

What I claim, therefore, as my invention,

and desire to secure by Letters Patent, is-

The application of guards or fenders c d e c d e to machines fordredging oysters, coal, or other sunken objects, said guards or fendersbeing constructed and operatin g substantially in the manner and for thepurposes hereinbefore set forth.

JOHN H. NEWCOMB.

Witnesses: JNO. P. GREEN HERMAN HAMBURGER.

